I knew building around Evolite Torracat in the Battle Tree was gonna be a pain.
So, Torracat with Evolite. It is working, but the problem is that its just a tad too slow and can get easily revenge killed. This was a foreseen issue, and I think I have a few ways to fix it.
Smeargle@Focus Sash/Mental Herb
Ability: Own Tempo
EVs: 252 HP/252 Spe/4 Def
Timid Nature
Stealth Rock/Sticky Web/Nature's Madness/Spore
I'm not sure if Smeargle can use Nature's Madness (and the reason why I'm speculative on that is because of Dark Void), but if not, I'll give it something else. Don't really want to get into breeding Smeargle again though.
Ariados@Black Sludge
Ability: Insomnia
EVs: 252 HP/252 SpD/4 Att
Careful Nature
Sticky Web/Toxic Spikes/Leech Life/Sucker Punch
This seems like the go-to for me because it can set up on Pokémon and maintain its position on the battlefield by utilizing Black Sludge/Leech Life for dependable healing. Stealth Rock is rare in the Battle Tree so I'm not too concerned about the rock weakness. May add an offensive Water-Type partner to cover both Aridos and Torracat, like Wishiwashi or something.
Kind of wish Shuckle was in these games.